The correct answer is option 3: "Indian Coast Guard is an organization under the Ministry of Defence."

Option 1: The Indian Coast Guard is not a branch of the Indian Navy. While both organizations work towards maritime security, they have separate roles and responsibilities. The Indian Coast Guard operates under the Ministry of Defence and focuses on civilian and maritime law enforcement.

Option 2: The Indian Coast Guard is not an organization under the Central Board of Excise and Customs. The Central Board of Excise and Customs primarily deals with the administration of indirect taxes such as customs, central excise, and service tax.

Option 4: The Indian Coast Guard is not a paramilitary force under the Ministry of Home Affairs. Paramilitary forces in India include organizations like the Border Security Force (BSF), Central Reserve Police Force (CRPF), and Indo-Tibetan Border Police (ITBP).

Therefore, the correct option is 3: Indian Coast Guard is an organization under the Ministry of Defence.